I have a set also. I wonder myself how well they will perform with the stock 1.88 intakes and some mild porting? If the chambers are 65 cc I wonder what the stock CR of my 89 truck motor was?
I'm sure somebody will be able to provide some specs for you. I have nothing but my own dyno run (no head flow chart) to reference. I am pretty happy that "both" Mike's referred me to the 308 heads vs. the Edelbrocks $$ at the time of my engine build. My brother Todd sold a '69 Cuda to AdamR about 90 years ago (sic) and that 'Cuda I think had a set of stock 308 swirlports on it.. Mostly a stock 340 engine, ran like a scalded dog.