A balanced and lighted bottom end will still top out at about 7000 at a push 7500 rpm (tops no matter what anyone says) any more and its rebuild every 500 miles, the design just doesn't support revs no matter how hard you bolts mains down with fancy sounding bolts and or straps.
The mains "can" be strapped but as mentioned once before one needs to machine new caps to enable you the ability to use a strap, the originals have outer half moon shapes and wouldn't naturally work with straps. Also as Paul says the oil pick-up pipe is connected on the middle main cap.
ARP bolts, what a waste of time, I would rather have a bolt break than be so strong that it breaks the crank. Secondly these special bolts apart from costing the earth (if you can find ones made for a Viva OHV engine) are designed to give strength for HIGH rpm and or Pressure loads as seen with high boost engines, we have already said more than the guessed 10psi is possible going to kill it, and likewise excessive Revs will do the same.
People get so hung up on brand names they forget the end goal and just have an engine that's got all the names on it.
Look the truth of the matter is the bottom end if built well, is fine, albeit the inherent end float due to only being a three bearing main (cure by using double thrust main bearings in the middle bearing not single as per standard fitments) The real issue is the head..... Get the head breathing and the exhaust system exiting well and it will be good.
If you want to go faster start with an engine that has capacity and capability, one that's already well known and worked on, one that's popular and has good after-market support.... none of the above apply to the weazy OHV its fools like me who play with them...
then again its time House started talking more about his 16v thoughts?