Hello, I was reading on the THE ALLARD REGISTER about their 19 Cadillac Engine Tuning Tips, article seen here: http://www.allardregister.org/blog/2013/5/23/19-cadillac-engine-tuning-tips.html #15 states "Oil pump – use the one with a piston in the relief valve, not the one with a ball. Or – adapt the pump from a 427 Chevy.". Has anyone done this conversion, or heard about it? I don't know if they are talking about fitting the 427 pump to the 390 block, or if you use the 427 internals in the 390 pump? I plan to tear my 60's 390 down this fall and I can get a 427 oil pump for comparison, I just wanted to see if anyone has done this before. Thanks for the help.