XE268 and XE274 cams

Finally,Here is the setup as follows!318/392,airgap with 1in 4hole spacer,stage 1 ported eddy heads with comp ultra pro magnum rockers,XE275HL cam with 231/237@50 and 525/525 lift,IC847 pistons,Eagle crank and Eagle SIR rods.Carb is gonna be AED 750HP!Also gonna order Dynamic 2500 stall for 727 as i sold Boss Hogg 2200-2800 because heard they aint that good.Building 8.75 rear,got the housing painted and buying new axle bearings and seals soon but will have to buy 742 or 489 case but need to know if i should use auburn cone type or detroit true trac with 3.91 gear and tire size is 275/60/15!Thanks and I cant wait to run this motor!Hopefully ready by end of the summer!Sorry i kept changing up the setup but now I have it figured out and satisfied!