How can i make 700 horse from a 410 stroker

Initial expense is the issue. Added machine work is the other cost that you already know is a bad taste. Any time money leaves my wallet there is a bad taste.

Off hand, I don’t know what a Ritter block costs and the additional expense’s are also an unknown AND a variable expense. Not all machine shops charge get the same.

More or less the same issue with the MP race blocks. Initial expense is a lot. If you’re a serious person and or racer, the price is acceptable when a honest big power mill is being looked at. Not many diving into their wallets for this. Few build anything approaching the actual need for a race block.
While I appreciate what your saying I have to say regarding race blocks that's a load of crapola lol. If you are complaining about a race block being expensive and then having to machine it then you don't need it. You should see what our buddy spent on his sbc dart block, it's pretty close in money spent compared to a mopar race block when done. Last time I checked a ritter block was around $4500 shipped and add about $1,500 to 2k in machine work unless @Brian Hafliger has something to add to that. Cheap investment for someone who want's a block to live reliably. My car is 3,500 lb. pig (race weight) street car with a stick that is legal to go 8.50 and that's the plan at some point so for me a race block is an overall cheap investment (and a requirement) to eventually achieve my goals.