The Crate Buster 355 is a great alternative to the GM 604 crate engine.

545 HP
517 ft/lbs on alcohol
3 lbs more than a 604 crate
Dart High Performance 4-bolt main block
Scat lightweight crank and rods
King XP bearings
Mahle Power Pak pistons
Total Seal rings
Dart heads
Comp Cams Roller rockers
Custom flat tappet camshaft
Edelbrock intake
Champ style oil pan
MSD distributor
Dyno-verified horsepower and torque
Dyno sheet for your motor is included
Piston rings are broken-in using a proprietary dyno program
Lash and timing are individually tuned
IMCA approved