The balancing act is the same with a blown engine as it is with a increase in compression in terms of a DCR.And the law of physics still applies where a smaller c.i. will have a torque curve higher in the RPM range.
The options of aftermarket blocks goes many steps beyond just a SHP. Raised cam locations,BBC cam bearings,etc.$$$$$.
I think like what you have a clear plan,to stick to that and work on gathering that parts for that is in your best interests.Some have turbo's,blowers,nitrous,and let them do what they will.Your plan is your combo.