Hmm...a "Stock Appearing" 2nd Gen...sounds like a fun project! A couple of the stock appearing guys hang out here (
Hemi Joel and
BIGDOG). Joel runs a stock appearing '67 Hemi GTX and Terry (BIGDOG) runs a stock appearing '69 ZL-1 Camaro, and these cars run 11.4 and 11.3 in the 1/4 respectively (low to mid 7s in 1/8)...oh, did I mention they do it on 6" Polyglass tires and through exhaust manifolds?! I've seen both of these cars, and they look like dead stock trailer queens, but they run like stink! Add a set of tires to either of these cars, and they'd easily surpass your 6.9 requirement, and would look no different than a fresh from the factory musclecar.
Try and shoot BIGDOG a message first, and mention I sent ya. Or, you could try posting your question over on the
STOCK APPEARING FORUM.