Welcome to the site!
I talked to Stacy Tucker of DSE about this very topic, and her response was that there is nothing wrong with upgrading the stock frame. This was great news since a few years ago I did the DSE c/o conversion on mine and use their control arms. I am entering the last year of my build and it's way too late to change the frame...and the budget doesn't allow!
For what you have planned there is no reason you can't use your stock subframe. As a matter of fact many have sucess with just doing the Guldstrand mod and not even converting to coilovers. I have read that just bolting on DSE or Global West arms and upgrading the steering box will make a huge differance. Hope this helps!
__________________
Tony
'68 Camaro
|