IMO it's not a bad price if you want to use iron for the stealthy look. I bought a street fighter torque converter (about $300, 10 years ago) for a friend and got his 351W street and strip ported 1970 heads with just roller tip rockers. Made 398HP and 395 torque on my 347 at the crank.
If I could go back I would have spent the extra money on 185afr's, but at the time I wanted a more sleeper look.
Haven't priced it, but those roller rockers are probably $200 alone?
$400 for rebuilt stock heads would probably be about the going rate??? and you got all the extra improvements made for extra power.