48degree blocks and heads
Now hold on there a sec. The stock block is 59 right. Your saying you can find 48* race block easier? WOW! I'm movin close to you.
I do believe thats it with the head and block issue. But you do realize that the cam has to be ground for the new tappet angle, right?
Do some checking around on other details. Please be advised I did say,
"I think" Thats it on the it. I'm not 100% on it. But I do believe thats it.