I have NOT used the Doug’s 453’s . I have installed many other brands in various A body’s. As soon as you mentioned ps I think you are on the right track. Ps makes this job MUCH closer in proper fit. The less expensive headers just don’t do real well with the ps. Maybe also TTI but check with someone who had used them with your EXACT combo.Half way through this with the cheap stuff you will be wishing you spent 10 times what you did. Swingn’…
