I ran a low compression pump gas 565 Dart Big M in my last 55 Chev that made 732/713 with a T56 in behind it. Out back was a mini tubbed 4 link 9" and the car was tied in with an 8 point cage which helped stiffen it up. Fun street car that ran through the gears in OK fashion if you were banging on it...but clearly, the trans didn't like the power. I had to modify the tunnel for that case to fit too, and now that I am building another 55 with a little less power, I have gone with the TKX 5-speed which really is the best of best from what Jody Haag told me.
Rows like a 4 gear when you just want to cruise, but can bang gears better than the T56 while standing up to about 700hp with no problem. I'll have this one on the road real soon and can't wait to try it out. Running a McLeod hydraulic clutch on this one and a Quick Time bell housing.
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I like solid lifter cars, big cams and cars w/ 3 pedals in them. 
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