dirt track'in a A-body

id like to build a 360 or a 340 with good heads but already got a 73 318 an a 85 318 an on a budget,..can swap in better motor later,...no vacuum rule in this class,...can move motor back to #1 plug in line with ball joint,...an no rule on wheel back spacing ether,...lotta good info in short time from you guys,..really great,...on dirt racing forum nobody has a clew bout mopar magic!! thanks a ton!!