Heads , 440

Well on the Dyno it's real easy. I don't know for sure but like I said the plug angle is very slight.
Oh ok, i was thinking it was in your car.. so i may just order these trick flows. I am assuming they will accept the factory rockers and shafts? Will probably be using my current hydraulic non-roller cam for the time being..
Also, i see this on the ad:
Notes:

Longer than stock pushrods may be required. Minimum bore size is 4.320 in.


So what pushrods would i need? Sorry, im used to the factory stuff so not sure.