I run the next one up the 513/533 in my 440. Stock 906 heads stock HP manifolds mopar electronic with chrome box eddy performer intake with eddy 800 thunder series carb. 28 to 3200 stall with 3:55 gears. Sweet cam. Great street manners makes tons of low end power.Pulls hard to 6200 rpm. Still makes enough vac for my power breakes. The Voodoo cams are excellent. The 603 would be a nice cam in the 383. But i think with the bore and 440 rods you'd like the 604