478 V6 Into '72 K20
Found a '73 478M for my '72 Chevy 4X4. Have the cross member, motor mounts, accessories, and the like pretty much figured out. I'm still not decided on the transmission though. The axles will be a Dana 70 rear (slid 6" back with 63" spring swap) and Dana 60 front with 3.54 gears. I want to add a .77:1 to .73:1 overdrive on top of that (80 MPH speed limit here in MT - 90 MPH isn't much of a stretch most times).
I have come up with 2 options that I like.
The first is to get a custom flywheel and run the stock SM465 married to the stock NP205 all bolted to a stock V6 pickup bell housing. Then add a 3 speed auxiliary tranny behind the transfer case. This would give me overdrive and great gear spacing for towing.
Option two is to keep the SAE adapter and flywheel (will have the whole rotating assembly balanced) and run a 7 speed Spicer and divorced NP205 transfer case.
This would be a little cleaner with good gear spacing and a nice .73:1 overdrive.
The thing is, I'm not sure that the SAE adapter will fit in the truck without heavy firewall mods (which I won't do).
Can anyone tell me for sure if the SAE setup will or will not fit?
Does anyone see any holes in my plans?
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