1972 307 cam selection... HELP!

[RustyBucket]

Originally Posted by pjmoreland

.... I know you already mentioned the rear end, but I think switching to a 3.73 would be my top priority in your situation. A 3.07 is a pretty extreme highway ratio to have with a 700R4. Switching the gear ratio could really transform the way your truck drives.

If you find that your truck is lazy or doesn't want to cruise comfortably in O.D. you might pull the shifter down 1 bump and run third gear. 3rd gear on the 700r4 is 1.00.... just like a 350 turbo in top gear. The 700r4 has a good low first gear(3.06) to get your truck rolling.
I have a 700r4 w/3.08 rear in my '71 GMC and a mild 350 engine & it's responsive enough. It really drives better & gives better mileage if I don't let it go into OD unless I'm running 70+mph. on the Interstate. It's on275/60/15's. Yeah, I'd like to have a 3.73 posi in the GMC & the Blazer both but can't justify spending the $$$$.