I got the rebuilt 200-4r transmission back from Phillip R this weekend. It's got a few upgrades over stock and should handle the power of the 377 without issues. The converter I'm using is a B&M Holeshot 2400, which was in my silver 240 for a little while.
Three issues with the install: one expected, one I should have expected, and one not expected.
For the expected issue... The JTR crossmember will not work well with the 200-4r. While the JTR book says you can massage the floor BFH-style, it just won't work with the position of the crossmember and the floorboards since this transmission mount is further back than with other transmissions. I went through the same issue with my 240. My exhaust guy sectioned the mount for my 240 so that it would fit in the tunnel without having to beat the floors. He'll do the same with this one when I get the exhaust done in a few weeks. For now, I mounted the crossmember upside down with a spacer between the crossmember and the transmission mount to approximate where the transmission will sit in the tunnel. I also only used two bolts per side since the mounting is temporary and the crossmember will be modified.
And for the should have expected issue: the wiring harness is too close to the header on the driver's side. I ended up raising the wiring harness about 4 inches above it's factory location to keep it from being so close to the header. The wires are wrapped with a heat resistant cover, but I still don't want them as close to the header as they were. I didn't get a good pic over the weekend, but will take one later.
For the unexpected issue: I got the transmission shifter cable hooked up, but had to modify the bracket to fit with the aftermarket transmission pan from yourcovers.com. The casting is pretty thick, which is a great thing, but the bracket had to be trimmed a good bit to line up properly with the bolt holes.
Other than that, I measured for the driveshaft and talked Paul into taking my flange by Driveline Service today to get them to make the driveshaft. They should have it ready tomorrow.
This weekend, I'll install the radiator, water pump, and alternator, as well as hook up the lines for the transmission cooler.
It's getting there...