440 bottom end strenght tips and oiling

Track day Road Race application
Building my 500 ci 440 for around 700hp at the crank
I have read the blocks crack and have difficulty over 600hp
Any suggestions on building a strong bottom end , block fill ect...??
History of 440
Right now the 440 is stroked to 500CI
440 source ported heads
hughes mechanical cam
A milodon HV HP oil pump 1/2 pick up
2 qt oil accumulator
road race 8qt pan
I lost a main bearing (started Knocking) last season

Motor is out for rebuilding with blower pistons and I am installing a Procharger
build up the bottom end and reseach better oiling tricks,
Dry sump ?
Some people grind a small channel in the main bearing for added lubrication?