The engine in the car now is a 640hp injected motor. It doesn't look like the car will sell this winter. I was planning on moving to a blown alky SBC in an altered car . The blown 377 may end up in the FED. I do have a 4.88 pro gear set in it now. I expect a 3.90-4.30 gear change if it gets the blower motor. The 8 3/4 has worked well and it's good stuff , aluminum center section, MW aluminum spool, MW drilled axles. NO doubt the Ford is stronger, I was curious as to what other FED racers have done with the 8 3/4. Thanks. George