FRANS

I'm thinking of either an E30 320 - 325 or BMW Mini Cooper S for the Targa, plus entry in the BMW race series. Would the latter, the Mini Cooper S be eligible for the 2lr Open Series or similar? I've had an E36 M3, which I drove in the Targa for five years, but am keen to go for something a little more basic and maybe less expensive. Any advise welcome please.