Let me make it simple for you.
A guy says he wants to run his 4.56’s and build a 340 and all you short dick clowns come out of the woodwork and tell him how stupid he is and how great an under headed 400 inch tractor motor would be for him.
That’s THE issue.
Don’t talk to me about engine building until you can do a valve job and tell me why you did it.
Get there and we can have a conversation.