Roller Block: Pushrods Rubbing Against Head

Okay goodness, was not expecting all the replies lol.

Here's the deal. It's a 92 LA 360 (my bad, I missed that detail). Springs are Comp 901s. Outer diameter is 1.494. The ticket shafts were correct in direction, I did mess it up but a quick fix showed me the problem still exists. I know the pushrods are wrong. I was in the process of looking at my contract point of rocker arm and valve stem tip with an adjustable pushrod to get the proper length ordered. I have a re ground camshaft and I'm aware of needing longer pushrods. When I took the adjustable tool out, I noticed it rubbed horribly on the head. Hence this post.

As far as the heads go, yes they were not original. The boyfriend picked this engine out of the yard and only brought one original head and then had another 596 head with it. I couldn't find later 308 heads in the local yards so I picked these out for $40 bucks a pair and had them rebuilt.

So yeah. Mainly my question was which carbide bit did people use to grind it pushrod holes, aka which shape worked the easiest. I would love to NOT have to disassemble these heads, but if it's the only viable option then I'll just have to suck it up. Then when I stop rubbing I can hopefully worry about proper pushrods length (unless it may help?) Sorry if I didn't word this all right, last night I wrote this quick and had to go to sleep for work early this morning. Thank you for all the replies!