Interest in Performance Parts for slants?

very true but with the exh on the passenger side there is a dizzy, wires and oil filter dead smack where tubes would normally go... now you could run them fender exit style

Spark plugs are generally in the center of the combustion chamber of a three valve overhead cam style head and if you're going to modernize the head on a slant, you might as well go to sequential port fuel injection and a DIS type ignition.
After all this, even if you were to keep enough stock pieces to retain the original oil pump/distributor drive, remote mounting the oil filter would be a piece of cake.
Most likely, if you're going to the trouble and expense of modernizing the engine with a multi-valve overhead cam head, you're probably going to ditch the original cam blank, modify the oil galleries and run a dry sump anyway!