You should start by looking at the cam recommendations for operating range. The Comp 270H (224@.050)says it's range is 1800-5800 RPM, and suggests a 2000+RPM converter. The Comp 280H(230@.050)cams range is 2000-6000 RPM, and suggests a 2500+RPM converter. But converter companies suggest to select a converter that is at an RPM lower than your engines RPM at 65 MPH. So these suggestions may help narrow down the choices you will need to make.
comp cams no longer has the 270 listed and their 280 now claims 1500-5500 in a 230/250. marketing? 'if' accurate, that is ideal. would even be milder in a 292! howards has a 223 and claims 2000-5000 also requiring 2500 stall. the cam I had in my 250 was comp cams 268. was inquiring about 292 options and was told they are custom order only but had one 219 @ 50 and 526 lift that they got stuck with, discounted if interested. it accidentally fell into the 250 when I was swapping the head and can say without any doubt that it was not over cammed. the real question is how much more! brand or supplier is secondary but here are a few
summit cams
