I have been toying with an idea for quite a while now. Ever since I first saw one, I have wanted a 1965 AMC Marlin. It just looks like it should go fast. But even with a stock V8 it wouldn't be fast enough for me. I thought it would be fun to shoehorn a blown 454 roller motor into it. I had even thought of adding a 150 HP NOS shot to it or would that just be gilding the lily? I had wanted a manual transmission. Question is: what manual would hold up to that torture, and what rearend would. You all have a lot of experience with BB chevys, so maybe you will know what works. Will a T56 work? I was kind of hoping for a 6 speed, at least a 5 speed. It needs to have OD, too. Would a posi rear work?