I started to assemble my 410" today!

Whlie you're at it, check the oil pump to stud clearance... You should have to shave a little off the pump body, run the 12pt ARP nut on that stud, and cut the stud shorter. It's easier to do that now rather than when you try to bolt the pump on...

That's a good idea. I'll check that before I go any further.