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If you can get a ready to run set of later heads,906/346/452, that don't need redoing then you can save money there. Maybe a set of valve springs and go.Otherwise 440 source or sidewinder heads will be far ahead in HP and have a smaller combustion chamber for easier compression AND less prone to...
If you can do the work yourself you are well ahead. Even if you are paying someone a cam and lifter swap with new timing chain and valve springs should be within your budget. Having the distributor recurved is a must in my book.
Or you could look around for a good running 360 that would be a...
3-8-Teen Dream
Something like the Comp XE256 (or similar specs/brand unimportant) with NEW VALVE SPRINGS will make a nice responsive package. Sure you can go one step bigger with the cam and find yourself wanting a better torque converter,then head work,etc,etc.
If you aren't experiencing detonation then I don't know how you could be hurting the engine. Run the 87 but if you hear it detonating switch back to premium. Or mix it half and half if you want to feel better about it.
Some people just don't like dealing with headers. Spark plug access,burnt wires,leaking gaskets (flange and collector),and poor ground clearance with some header designs. They just want to get in and drive without the little hassles. I get it.
If I had to choose between a good set of heads or a...
The better the cyl head the easier it is to make power. A good set of heads with something like the comp XE274 or similar would work.
A hyd flat tappet with the same figures will get you there with stock rockers and valve covers.
I wish you all the success in the world with it!
My first car was a 73 Charger and I would love to clone it. Don't see it happening but a man can dream!
I would want to know what gear,converter stall,and vehicle weight before I comment.
My guess would be trying to get the cam to come in sooner in a heavier car with a motor that is not known for bottom end torque.
I would go with the magnum one. Should be red for 69 I believe? Does your car have factory exhaust manifolds? If so are they HP or log? HP would have been a magnum and log style would have been four barrel IMO.
Techron and seafoam are good additives IMO and have been for years. I wouldn't have a problem using Lucas either.
BG 44k has a good reputation and we used it quite a bit at the shop I work at until their rep disappeared.