And following on from our conversation, you might want to look at the specs for the Comp Cams XM270HR, but you will probably need headers to get the best out of it.
Great little upgrade cam for your 305 but you will need new valve springs - the stockers won't handle the lift of the new cam.
Yes we are, We will be meeting at Morrisons in Horndean. Trying to find out the times, possibly 9am, we will talk about this at club night tomorrow, so will post once a time is agreed.