Engine/Transmission Part Selection

I like the sound of this build. I own a six pack car myself and I have found a few things that six pack cars like. One thing for sure and especially if he is looking for a cruiser and occasional bruiser, I would build it mostly stock. So lets start from the top. Six pack induction is fine. The heads I would talk him into the 440 source aluminum heads because its hard to redo a set of stock heads for the money and they flow half way decent plus they look stock. If he insists on using the head he already has then thats fine too. Just know aside from valve size pretty much all the big block heads are esentially the same. Cam, I would use a comp XE270 myself but it will have a little lope to it as the factory 6 pack cam will too. You really can't go wrong with the 6 pack report cam but the comp 270 will make another 20-25 hp. The bottom end will be stock everything except the pistons, I would use KB zero deck flat tops KB237. I would use the .041 thick gel pro gasket and with the stock open chamber head it'll be around 9.8 to 1 compression. The problem with a steel head small cam and almost 10 to 1 compression is that it will want to detonate on a hot day but you can take a little timing out of it and it'll do just fine. Thats where the 440 source aluminum head is good it does away with that because of aluminums ability to absorb heat. So converter, you will want to spend a good amount of money here because its not just about stall speed. I would go with a tight 10 inch converter with 2800-3000 or so of stall speed. You will get better torque multiplication out of it and it'll soften the hit at the shift at part throttle plus it'll wake it up with the highway gear. These motors really only have a 1500-2000 rpm power band and its nice for it to flash into its power band when you floor it. The trans, most 727s are the same with the Hemi and some 6 packs having the four gear planetary. He doesn't really need that and a stock rebuild with a 4.2 kick down lever and a trans go 2 stage shift kit would do great. I would go with the 3.55 rear gear over the 3.23 because at the end of the day there is about 200rpm difference of rpm at highway speed but it really helps in the torque multiplication. It sounds like a fun car and was this your dads car or another Charger R/T?