I got the Gude head package. 165 WHP when I was done. It might be alittle higher for you with an exhaust.
It took me 10 months to get my 550.00 core charge back.
The keepers needed to be milled when I had the Guides done in April of 2002 when I rebuilt my motor. The keepers were killing my valve seals.
So that is my take on Gude. Good product but I had to wait on my core refund and the quality control killed me. I pulled the headoff and replaced the seals once and put it back on when it ate up the seals again. Then had a machine shop look at it and they fixed it when they did my short block.
It runs great now.
Have fun.
Tom