YY1, yes stock ratios can be all over the place, but if yours are in good shape, and you don't have insane spring pressures, changing them is about as useful from a performance standpoint as chrome.
20+ years ago, the MP heavy duty rocker set was closer tolerance (ratio), and thicker to hold up to higher spring pressures, but those U.S. built sets were replaced by offshore stuff that is NOT as good as the stock stuff.
I can't comment on cloyes quality nowdays as I have no experience with them, but the Australian built sets are very good (I can't remember the name, maybe someone else can provide it). However for a primarily street engine, any steel replacement chain set will last longer than you or I will live. A roller will not make more power and the chain gets more than enough oil to lubricate anything you chose.
Personally, I only use "swap meet" used chain sets as they already have the initial stretch imposed. The benefit is that once the cam is degreed in, it won't change over the years.
As for intake gaskets, I only use the stock stamped steel units --- I use them over and over and over! They don't wear out, and a very thin film of silicone RTV (very thin being the important part), assures a perfect seal. In fact the only reason that a stock gasket wouldn't work is if the block or heads were milled without the intake mating surfaces being machined to compensate.
Should this be the case, you will get leaks, no matter how much you mess with it, no matter what "band-aid" fix (gaskets) that you try. You are much better off with proper machining as opposed to the "fixes" that are out there for improper build problems. On a stock, or properly machined BB mopar, aftermarket intake gaskets will only cause sealing problems.
All this is only my opinion, but I have been dealing with these cars since they were new. I just hate to see money spent where it does no good, or even worse, can be detrimental to performance or durability.
To Rusty.... I agree that the Ductile rockers are the absolute best for durability. I have two set's of Isky's that I have had for 35+ years that have close to (if not over) a million miles on them. No exaggeration, I still daily drive my old cars.
I have replaced the shafts a few times over the years as the shafts take all the abuse. Point being that hard chromed shafts will force the rockers to take the abuse, so I don't personally see how this would be an upgrade. But in any event, be prepared to wait for a long time with RAS (actually now known as "Rocker Arms Unlimited" for the rebuilding service). I know a guy that waited nearly a year for rebuilds. --- In any event, don't buy shafts first as they (RAS/RAU)use reduced diameter shafts so as not to weaken the rockers with oversize bushings. They provide all related mounting hardware to compensate for this, but unless they have changed recently, It's a long wait, Good quality, but a long time, plus with the hard chrome shafts, the bushings take the wear so unless your rockers are severely worn, you are probably better off just polishing the bores and shafts.
My opinion anyway.
