It's the basic economics law of supply and demand. There's a butt-load of Mustangs + Camaros out there. There's a bunch of performance parts suppliers willing to create new heads, cams, and other horsepower generating pieces because there's a good chance someone wants to be faster. More pieces manufactured and sold drives DOWN the prices IF the parts deliver the goods.
How many threads have you read about 370Z head or cam swaps? Ford and Chevy small blocks have been around in one form or another for 50 plus years.
Now, if you want to know IF the 370 can be made into a drag car, another old addage applies....the only substitute for cubic inches is cubic bucks. Check out the cost to make a supra generate 1000 hp.
Then there's cubic inches AND cubic bucks if you make the entire motor yourself....
932 cu in, 2140 hp for only $93k
EXTREME PRO STOCK 932 CU. IN. 2140 HP RACING ENGINE - Sonny's Racing Engines - Sonny's Racing Engines