Clutch problem I think

I'm looking to break in engine with a 4spd bellhousing that @Bennoel 10 graciously loaned to me. :thumbsup: I have flywheel(6 bolt, 7/16) but unsure of which bolts?
I see Brewers has 2 different 7/16 bolts?
Thanks
Steve
Brewer's Performance - Mopar A833 4-Speed Transmission and Component Specialists

Brewer's Performance - Mopar A833 4-Speed Transmission and Component Specialists