My wife and I did a body-off resto on this and initially kept the the original 170 ci 85 hp flat-head 6, 3 speed manual trans w/ overdrive. We showed it like that for about a year. Then I decided it needed more power...It still looks the same as it appears in the pictures, (clutch pedal and column shifter still there) but under the hood there's a GM performance zz4 small block chevy (355 hp 405 lb ft Torque) bolted up to a 700R Trans and mated to a 8" Ford diff with 3.80:1 gears. Now we don't feel the least bit intimidated getting on So. Cal Freeways.