Can you please share some pictures of this oil pan and the pickup? Maybe one could hand fabricate/ make a close copy of that stuff. I’d like to see what we’re workin with.How much work do you want to do? I can tell you what you need. It’s not hard.
You can do it on iron heads IF you dont mind grinding. You need a single plane intake. At least 1.750 headers. 1.875 would be better.
You‘ll need to be in the 285ish cam range. No less than 11:1 compression.
You need to make power at 7k and shift at 7400-7500, so you need a GOOD oil pan with the biggest diameter pick up you can find. The Milodon Super Stock pan is the BEST choice. Good luck finding one. I have two. With the near impossible to find pick ups.
You should have pistons without tractor rings. 1/16 rings should be the thickest ring you should have and an .043 or 1 mm ring would be better.
The rest is getting the valve job right, the round stuff round and the straight stuff straight.