I have made adapt style motor plates early hemi to glide.
JW transmission offers a seperate bellhousing 392 to PG, but requires another adapt piece (no pic in catolog) and then the 2 issues of a starter and crank to flexplate spacer while using a .250 motorplate.
If running a blower, a blower starter eliminates those issues.
Picture is a 426 to PG motorplate