I have used a few dif. sets of jeff Johnson covers, all with good results, as you know I am currently running a set of billet covers with a one piece o ring to seal instead of a gasket,if you go with the jeff Johnson covers, he may be able to install them in your covers, I know there is one of our mopar brothers in Australia I think who is/was making billet covers for B1 heads,that would be the route I would go if you can find him....