i have a 1985 460 i wish to replace existing heads with heads pre EGR. My question is will the older heads prior to 71 72 simply bolt to my 85 block and if so, for low end torque which heads would you recommend?
Your 1985 460 came from the factory wtih D3VE heads. The heads that you might be interested which would raise compression ratio are the C8VE, C9VE, or D0VE heads. All these heads are essentially the same overall configuration.
Also, all the heads in question have E.G.R. (Exhaust Gas Recirculation).
If you mean that you want to get rid of the air pump (A.I.R. = Air Injector Reactor), then the C8VE and C9VE heads are non-A.I.R. The D0VE heads may or may not
be drilled with A.I.R.
All that being said, if the heads are drilled with A.I.R., this does not in-and-of-itself hurt performance.
If you want low end torque, I would recommend that you install a set of early style heads (C8VE, C9VE, or D0VE) that have been bowl blended on the intake and exhaust bowls. The early-style heads will raise the compression ratio on your 1985 engine from 7.7:1 up to 9:1. The increased compression ratio combined with the valve bowl work will dramatically improve torque.
Additionally, the 1985 engine has a timing chain in it that retards cam timing by 8* relative to the crankshaft. Install an aftermarket double roller chain and position the cam back to the earlier straight up position and more torque will be realized.