I just bought a roadster replica with a 5.0 HO (converted from EFI to Edelbrock Performer and Thunder Series carb) and the WC T-5 (0.68 OD). Mine has the Ford 9" with some sort of limited slip (reported to be 3.70 ratio), nobody seems to know which one as the car has changed hands many times since it was built.
I have no idea of horsepower but I do know that it cruises at 70 MPH at about 2100 RPMs. That is at the bottom of the power band but with the light weight of the car it does accellerate well when passing without downshifting to 4th. The car has 295-60/15's on it, I'm thinking about replacing them with 295-50/15's just to get the cruising RPM closer to that 2250 RPM target.
As to the OP's question, every now and then I do get a bit of chatter from the differential.....it was unnerving at first but now that I've gotten use to it, it bothers me less. I thought something was caught up in between the pinion gear and the ring gear the first time I experienced it. So far neither of my rear wheels needs to "slide" or "spin" to get around a corner, so it must not be a true locker.....
Dugly
