What with Tod's block & Head, Bill Stipe's camshaft, Rich's Pistons & Rods, Burlington Crank (whenever they are made again), Dan's timing & Crank gears, Stainless valves, One piece guides, adjustable lifters, etc, etc . . .
Now if someone would just offer a complete long block
Then there's Rupert's water pump, Berg's radiator, Stipe's oil pump, Mike's oil filter, (and on, and on) ...
Got just about everything covered.