I had built a 505 stroker. here is the list of parts:
440 bored .30
505 stroker kit from Ohio Crankshaft
84cc Edelbrock heads with stock rocker arms
Edelbrock Torker 2 intake
Holley 850 carb
HYDRAULIC − Serious street and bracket
race cam.
10:1 compression, lower gears,
headers and 3500+ stall.
Hyd. Hyd. 3000 to 6500 21-229-428
Single-Bolt
XE295HL 295 307 251 257.564.564 110°
Dougs 3" headers

Took it to the dyno and it only put out 231 hp and 286 torque.
I lost probably about half the horse power somewhere.