Just an idea Steve, since you are getting a new crankshaft for the new motor why don't you get it with an LS7 snout to run the LS7 oil pump, timing chain cover, oil pan, & run an aftermarket oil tank!!!! The harmonic balancer should also work with your current drive you have?? If not just get an ATI dampner & we will machine a crank pulley for you.. If I was building an LS motor from scratch.. This how I would do it
GM spent a good chunk of $$$ to develop this dry sump system!!