Should I leave it Stock?

As long as the intake surface is machined too the intake will be untouched and work in any correct head. Keep an eye peeled for a pair of heads. You can pick them up cheap.
Like these?
Set of OEM 1964 - 1965 Mopar 273 CU V8 Cylinder Heads 2465315 for sale online | eBay

I am not sure what you mean by intake surface? On the head or the block?