Big Block fenderwell headers? Proparts?

We are mocking up a set of his 2-1/8 headers on a 73 Scamp with a 440/493 conversion, we are using the A/R engine plate, initial mockup was ok, may need a little massaging of the tubes, we definitely had to open up the fenders larger than the templates given. We will be setting motor in again over the next week or so, our motor is also using the raised port Edelbrock Victor 440 max wedge heads which pose more issues ! I'll try to post some pics..