Do I really save much?

Start comparing parts cost.

For heads I'd go with the RHS X heads, better than the Edelbrocks from a performance standpoint with no additional work to them. Check with member OU812, here on the board for his set up, about $1400, and they kick the snot out of OOTB Ede's. More than a few out there and they make 500HP on a stroker without a problem.

Since you are in Canada, who knows what the cross border cost might be.