I don't know what engine you're running, but if it's a small block, you could just get a decent converter and bolt a 904 up to it.
My car weighs 3,600 pounds (with me in it), and makes 445 rwhp (470 torque) which translates to approx. 525 flywheel hp and runs about 118 in the quarter mile, and this 904 handles it like it was a 170 slant six.
A 727 wouldn't be necessary unless you're running a big block, or have over 600 hp (which you may well have; you never mentioned your engine.)
Mine is a Vortech blown 360 Magnum with 10 pounds of boost, and as I said, that 904 (built by Len Schneider, in California) easily handles the output of that motor; no complaints.
Just another thought... IF it's not a big block.
