I have TTI headers on a small block with stock K-Member and they fit perfectly. I personally don't see much value in using the QA1 K-member for your application. Small block in an A-body is common practice. Everyone will have their own opinion on this topic. I welded my K-member, used adjustable strut rods, tube type tie rod adjusters, tubular uppers, boxed in the lowers, and used 1.08 sway away t-bars. the difference from stock was amazing. I'm still using cheap KYB shocks and I don't have a sway bar as both are on backorder from Hotchkis for another 2 months.
To answer your question about drag racing, if you plan to street drive and drag race, the adjustable shocks may be best for you. That way you can loosen the extension and slow down the compression on the front shocks when you race.
