'51 331 Hemi with 904 auto trans
First off, is it an extended block or not? Makes a huge difference.
Extended:
Not:
If it's not an extended block, try WilCap (https://wilcap.com/index.htmlor) or HotHeads (https://hothemiheads.com/transmission_adapters/index.html) for adapter kits. The adapters are for 727s, but they work with 10" convertors, so you may get them to work with the 904.
If it's an extended block, good luck. Sorry.
First off, is it an extended block or not? Makes a huge difference.
Extended:
Not:
If it's not an extended block, try WilCap (https://wilcap.com/index.htmlor) or HotHeads (https://hothemiheads.com/transmission_adapters/index.html) for adapter kits. The adapters are for 727s, but they work with 10" convertors, so you may get them to work with the 904.
If it's an extended block, good luck. Sorry.