Finally desided

I spoke with Mark. AKA Vortecpro last week I saw his add on ebay so I figured I would give him a call. We spoke for a few minutes and I told him what I was looking for he steared me to this forum before I made any choice.
Well I am blown away by the numbers he is getting from his BBC. My mind is made up for sure. I do have a question is there anyone that has had Mark build anything other than his 475 / 505 BBC 468? /496? four bolt main GM steel crank on the 468. Heads other than GM?
I am just trying too get all my ducks in a row before I call him back with the combo im looking for.
Thanks

68 Chevelle
468 10/1
049 Heads
Engle 292/590 solid
Team G intake
Allison 750 cup carb.
N2O Cheater system
ATI 400/2500
Moser Rear 410 pro
MSD 6A W/Soft touch rev limit
2step timing retard
275/ ET Street Drag Radials