T-3550 in a '65 Coupe

I bought my trans mount for my 3550 from Dark Horse Performance.

I cant remember exactly but thats the pic of mine at the correct angle. Looks like 2.5 to 3 Degrees.
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the correct angle is:

1. minimizes the angle of each u-joint (max recommended angle dependent on driveshaft speed)
2. working angles of u-joints should be equal and opposite

i commonly see references to driveline angles being three degrees, however without a reference it doesn't tell you much.

modern driveline is another vendor that should have a mount for a 65 with a tremec. however, some of those crossmembers will drop the tail of the transmission to get it to clear. if you are running a z-bar setup, plan on potential binding if you drop the tailshaft.

excessive working angles could lead to fast u-joint wear and/or driveline vibrations.

search kiesler's site. they machine one of the plates on the side to clear as you have questioned. i took the plates off to see if i could do it and decided against that route.

here is what it looks like under one of the plates for your reference.