RUN away from the Comp stuff. It is MASS produced junk that is not even ground by them in house. I am a cam designer. Our founder wrote their cam design program back in 1977, which they have totally destroyed, IMHO. Comp is nothing more than a marketing company as far as where their talents are. There is a reason why they HAVE to spend millions in advertising each year.

And Crane is no more.

Unless you run a solid lifter cam, don't use the Victor Jr. Sure it's a great street manifold for high rpm usage. Unless you have a cam that is going to run in the 3500-7000+ RPM range, the Victor JR is going to murder your low rpm manners and power.

And unless you are going to cam it with a solid lifter cam to take advantage of the greatness of the AFR heads, use a pair of stock vortec heads instead.

You can install all of the high flowing bolt on items you can dream up. Engines being the air pumps that they are, are controlled by the cam in terms of their air flow demands. Until you cam accordingly and hence increase the engine's volumetric effectiveness by so doing, you are going to get VERY little for your money and efforts in buying heads, intakes, etc.

Most stock engines could have more HP if they could get enough fuel and air through them. They are restricted through the heads intake and carb. So adding better heads etc… will gain ya power. Be sure to get correct intake and carb for the cam you plan on using. I port my own heads and port match the intake to the heads and port match the exhaust ports to the headers. You are planning on installing headers right? Restricting the exhaust can also rob horsepower so headers are a cheap way to let the exhaust flow better. The larger tubes the better. Also mufflers are a must none of us want tickets but there is decent mufflers available that restrict a lot less than stock ones.

No way 400hp with flat tops.I wouldnt be too concerned with hi flow heads with flat tops either.You didnt say what the specs of the cam are,but that is critical in knowing before you decide on intake and carb.The 5 cubes from stock is really nothing,my best guess as described is,sorry,alot closer to 300hp than 400hp.

I think it will be around 400 if you change the cam and put the 180's on it. Now far the fuel. High rise manifold and 680-750 carb.Gonna be expensive 3K

It will have around 425 hp if you use proper cam with your heads. Victor jr is wrong intake use rpm air gap dual plane and that cam with flat tops it will run great750 cfm carb