I have "Been There, Done That" on a 3250. I tried all that clunk drilling, large fuel line, spray bar turning, glow plug , pump/cline, proper fuel stuff and did not do a darn thing and was a waste of time, money and effort to solve the problem at hand. The simple fix was a carb change. Now doing all that stuff would probably make the engine more efficient but IMHO would only mask the initial problem at hand.