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Most of the NHRA stockers required to run flat tappet cams are running billet cams with Trend tool steel lifters. The good cast cam cores that Comp and the others used are no longer being made or available.
I hone the piston pin bores to give 12-13 tenths clearance in a pressed pin situation, it's a lot better than the 5-6 tenths they come with, that said the Molnar rods are the best deal out there for a great set of rods.
I put them on many 62-65 street cars back in the 70s-80s with low and raised blocks and would buy 68 Road Runner pipes from the local auto parts store, never an issue.
I just balanced a stock piston 383, Bob was 2460 and a 440 with 2295s using stock pins so very close to stock, Bob was 2580ish, might be off a hair but the notes are in my shop, I'll check it tomorrow.
I've been drag racing BBMs since 71 and spun a bearing in 74 and again in 94, never any other engine damage. I've known many people who could break anything in short time.
I used to write tech articles for High Performance Mopar back in the mid to late 90s, they were mostly cylinder head based along with flow bench numbers. It was a lot of work without the internet we have now, sending pics, all Tri-X 400 and having to fax back and forth for me to proof read, it...
You cut the pin down, the cast 440 piston is about 30 grams heavier than the cast 383 piston, not sure on the 400 cast, I'll weigh one later if I get time.
The 72 and later 440 piston will give you the same deck height as a 68-69 383. I have a nice set of 72 style .040" over Speed Pro flat tops that will go in a 400 if I get a block, it'll be just to sell.