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Re: 75 GMC sierra classic face lift and conversion to short bed
It must be hell to get parts out there....
You can run the th350 with a 383 or an LS. They make carb kits for LSx engines so you wouldn't need to run or tune the EFI. The 700r4 would require changing your drive shaft.
The flat tappet cams tend to wear faster and have to be broken in properly or you will ruin the cam. Around here they need oil with more zinc in it. Not sure what oil you have out there (may not even be an issue). The roller cams will last longer and can be more aggressive than the flat tappet cams. The only real downside is the price as you can see they cost more money.
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