First question, what's your budget for the "complete" motor?
Carb to pan, headers, distributor, plugs, wires, oil,..... Everything.
Then, is your car currently equipped with a fuel and cooling system capable of supporting a 650hp motor?
If not, are those upgrades budgeted separately...... Or do they need to be included in the "engine" budget?
The question boils down to this. Irrespective of any other factor is it 'cheaper" to build a BB or BB stroker OR new hemi to support a 650-700hp target STREETABLE aka hot rod, restomod or whatever you like (in other words not a full time race car)
This is more of a what if or a bench racing question not a How do I build... question.
