I just put in a 350 that has some tweaks(shaved heads, larger cam, bored to 357, 9.5:1 compression) in my 77 GMC K15. It runs great but now Ive been through 2 hi-torque starters (broken noses) and having trouble with the 3rd. It seems to lack enough power to crank the engine. It will turn over slowly if at all unless its jumped from another car and starts fine but the cranking is overly loud. I have had the battery(optima 800) checked which is relatively new, played with the timing, adjusted the shim of the starter, and checked the alternator but cant seem to find the problem except for lack of amps. Do I really need more than 950 cranking amps? Please advise before I screw somthing major up. Thanks, Sawbones.