318 hp question

230 is the gross rating. 150 is the net rating. Any other differences is hardly worth mentioning. I will mention them anyways. The '69 will have a little lighter rod (quicker rev) but it's not quite as strong. No, you will not feel the "lightness" off the rod by the seat of your pants, and no, it won't kick a rod either. The compression is 8.5 to one vs 9.0. No, you will not feel this by the seat of your pants either. Use the best motor of any you have, because the little differences that I pointed out is not worth the discussion on the performance. Oh, by the way, the heads on the '69 will need hardened seats for todays gas. I would not put any money into those heads. Too many good options out there to be messing with an old set of 318 heads. I have cut 360 heads .040 and never had a problem bolting on the intake. Actually, the intake fit better (I didn't use the cork end gaskets, just a beam of RTV)