I don’t know what the 051 head is, but if it’s an open chamber the piston needs to come out of the deck. I’m not a fan of milling a bunch off the heads. It makes gasket sealing tough.
Also, 10:1 compression ratio is a good starting point. Don’t buy an off the shelf cam. Don’t buy an off the shelf computer. Buy a Holley clone that is a double pumper and learn to tune it. You have enough gear to run a Strip Dominator or an M1. Do it
Your biggest issue will be headers. There ain’t a header worth a single crap out there for that chassis. Not one. I haven’t seen an off the shelf header that wasn’t 40 HP or more off a decent header.
My last race car was a 64 Barracuda. I made 2 sets of headers for it, and paid a guy to make the last set. Of course, I had a lift off fiberglass front end and no inner fenders so I had some room.
If you have the option of using a 67-75 or 76 A body, I’d use it just so I could buy headers.
And I love the early A’s. They just don’t have any room.