Kinda what I was thinking....Ill be able to afford the TF heads then tooFor just drop in and go. I would go with the 383. Most people don't give the 383 the respect they deserve. I have had several 383's than ran pretty spicy. Enjoy the 383 and build a stroker out of the 440 over time.
Not to be a stick in the mud, but myI come up with about .100, and then you'd have to take about .123 off the intake side (.0123 for every .010), or the intake will never seal.
Another valid point...but temptation for the HP in a bottle will be high!440 all the way. Lower compression is good, so you can run cheaper gas. Then you can sell that 383 and never look back. 57 is alot of cubic inches of advantage to start with, then with all of the new stuff that you will wind up putting on it anyways, you will be headed the right direction.
With no other changes I see why you were less than satisfied. But changing to a cam/ intake and carb that can use that increased compression effectively can really wake things up. You have to consider the entire package.I have milled factory heads 0.120" to use on a 426 wedge, to increase CR from the 7s. It made veeeeery little difference to the performance.
Comparing a lower compression 440 to a 383 is a cheese/chalk comparison. The increase in cubes is 15%, which is roughly what the tq increase will be. A point or two of compression in a 383 might add 5% with a tail wind.
440 pistons .017 in the hole..... or .170?Im guessing there was not enough clarity..so here again is the basic parts list.
35k mile smog 440 short block, flat top pistons .017 in the hole
Older rebuilt never fired and stored 68 383 with 12cc dished (2bbl) pistons .007 in the hole.
1 set of fresh Eddy heads with 70cc chambers
Cometic custom .028 head gaskets (4.35" for 383/ 4.45" for 440)
Performer RPM 440
Performer RPM 383
Lunati 702 big block cam
1.6 Roller Rockers
Eddy 800 AVS2
Fitech 600hp capable EFI (and supporting fuel system)
Pick your parts for most smiles pergallon with 4 trips to the track a year...and cruising/bragging on the weekends.