A friend of mine bought a D&D Super Hawk 500 HP....Blah Blah...Blah..... long block. It dynoed at 338 RWHP. They ended up sending him a different cam and it then made 342 and peaked at 4800 RPM. Didn't make any more power all the way up to 6500? They use Erson cams .
So he spent more money and bought a Cam Motions custom cam and made 405 RWHP. . Too bad it ended up dropping a valve the second time to the track and broke the block, head and piston.
Fastfive0 has one of their 347 short blocks. from what he told me, they gave him some free stuff becasue he would "only order if they gave him a free gasket set" and some other stuff.
motor runs around 110mph with 185s, good cam and ported gt-40 intake.