Currently looking at buying a 73. How can I tell for sure which engine it has. Owner claims its a 350. May well be but doesn't seem to have a lot of power. Also says only 30k on rebuild. Has 33's with 3:07 gears. also no fuel inj. Could those be factors? Engine sounds and runs GREAT. What gears should it have with 33's? I figured 3:50's would return it to stock rpm. Am I close? Want to tow a 19 ft trailer(light weight).