[Dave at Pelican Parts]

The heat exchanger "wrapping" is, I think, held onto the pipes by having the lip around the two halves bent over. There may be welds as well.

The usual solution is to drive the car and let the oil burn off. It's less than entirely elegant... You can also remove the exchangers and soak them in solvent for a while...

The other thing to check is your fuel pressure. A partially-blocked fuel supply will give you similar symptoms, so if the pressure drops off as the RPMs climb, that would show a delivery problem.

You can (and should!) also inspect for kinked fuel lines, particularly everywhere "upstream" of the fuel pump. And check or replace the filter.

--DD