Im not sure of actual cost involved. But I would say if your not going the ALL NEW route, There absolutely has to be a lot more sprint parts out there available. IN the last couple years whole teams have sold off what could be considered cheap. Theres also good used high end equiptment (Refreshened) out there. Wheels, rear ends, Front axels ect.

Not sure on the Midget. Also check into how many races you can expect to get between refresh's on the Sprint and Midget engines. Don't know for certain but I know they are really winding them midgets up and a lot of times in the sprint, You don't need all the power thats available.

Just some thoughts. IM certainly no expert