pishta said

motor plates are a solid mount but work wonders for custom header room. Its not that hard to rig up a mount if you have a picker and a welder. The Streetmaster mounts (65 A to B/RB) I used were just 2 nested U channel pieces that were bolted up like a hinge. The bottom piece bolted to the K and the inner piece rotated up to bolt to the insulators. Very "fabricatable"

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Gdub310 said

Big block K-members were only made in 67 - 68, are pricey when you can find them used, and from what I have read, don't work with all RB / B block castings. Direct Connection produced a big block K-member for a few years, but they are pretty scarce now and reportedly were not of the greatest quality when new. Another option is to modify a 73+ small block K-member. Sorry - don't mean to rain the gloom and doom on you, but I just went through this myself trying to figure out my path to a big block swap.

There's lot of good info on this page - definitely worth a read: Tips, Tricks And Tight Spots

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