Ok - that's a good bit of information. Easy to calculate rear end ratio - watch this YouTube:

https://www.bing.com/videos/rivervie...EC916A3E02D5CF

Don't use the 624 heads - they really are a limiting factor here. The stock Vortec heads are a lot better but the Floteks will provide a significant upgrade and will work better with the cam you have installed. Headers will bolt right up.

The Edelbrock Performer is an okay manifold when used in conjunction with an Edelbrock 650CFM (1406) carburetor.

The valve train is critical - hopefully you have the lifters that were used with the Trik Flow cam. Be sure to lube the lifters really well when you put things together.

Have fun,
Glenn