If I may be so bold: Pete, as far as the pushrod length, this is kind of a loaded question. I would suspect that with a reground cam, they'll take off somewhere between .020"-0.060" off the base circle of the cam, which by most standards would require longer pushrods, unless you like non-existent lifter preload and a noisy valvetrain sans solid cam.
...that being said, any engine you assemble really deserves the due diligence and scrutiny of measuring for proper pushrod length and valvetrain geometry regardless of the sum of the parts going into it.
Case in point: A very good friend of mine built a Ford 302, .030" over, stock deck height, stock type head gaskets, bought Edelbrock RPM heads that supposedly don't require different length pushrods...long story short, due diligence was not paid to details and despite outward appearance of proper geometry, the engine started consuming oil within 5k miles and was subsequently torn back down to discover the valve stems worn out of spec due to bad geometry...yes, we checked after the fact. He wound op buying custom length pushrods that were about .065" longer than stock and never had another days trouble with it.
Now, before the armchair quarterbacking begins, I'll confess to being more of an engine assembler than a builder, as is my friend, Paul. Also, the Ford moniker has zero to do with the fact that aforementioned scrutiny would've saved a few hundred dollars in replaced parts/gaskets, machine work, and a weeks wait from the machine shop.
I'll close with an apology for replication if this was/is something you already knew or planned on...
