vettesbydesign

Anyone know much,or anything about these?I have found little,except they were over the counter heads for 69/70 Z28s,very rare,never came on US production vehicles,but did come on prod.Cars in Cananda,they are 64cc double humps.One guy said they were about the best performing factory.SB heads he has ever used.
I have a set that already had screw in studs,and hardened seats,and have them at the machine shop getting 2.02s,and 1.6s installed,and some other trick stuff.
I plan to run them on my 68 DZ 302 that has 65 461 heads now.Any thoughts here?
Thanks!!!!