Well, the 401 in my car has good power and runs great but i feel is getting tired. I have another 401 that i was told came from a 65GS so i will be posting up the marks i find to know for sure. The engine is clean and complete. My plan for now is to do a compression check on it sitting on the stand so at least i will know there are no major issues before tear down. I have pulled the valve covers just to get an idea of its maintenance history and it it spotless, no sludge or carbon build up. If it looks good i plan to keep the lower end stock, just freshen it up. I plan to change the cam to a thumper with roller rockers, port match the heads to the intake and do the intake mod. One of my questions is does anyone make roller lifters? Who is a good contact for OEM steel head gaskets? What can i expect for HP/torque? Once the engine is done and in the car i want to drop the gears in the rear down to at least 4.10's and if finances allow i will put the gear vendors overdrive in it. I want to keep up with these GM 383 strokers and big blocks if possible but still keep it a Buick at heart. Anyone have any other idea's or opinions that might better my goal?