62GOLDENRODVAN, As far as power goes with the 200cid in my van, I would say that since I am not a lead foot anyway, I have enough power for my needs. Also with the early Econolines they were not designed with high speeds in mind on the freeway! The way people drive on the freeways here in S.Cal - FAST; I pretty much need to stay in the slow lanes. I don't drive much on the freeways with the "Old" (64') Econo anyway. Orginally I had a 4:11 rear end that made my van feel like it was screaming at 55mph; so I installed a 3:50 rear end quite some years ago. It is much better, and I believe that from reading other posts, that you can definitely go to a 3:25 or possibly a 3:00 rear end. My van is a 64' "Heavy Duty" model and has a 9inch rear end. I actually drove my van from S.Cal up to the State of Washington and back quite a few years ago, with my previous 200cid engine, and it wasn't too bad. Of course people are driving even faster now! So to answer your question, I think the power is plenty for the limits set forth by the drivability of these "Old Vans" and dependent on which rear-end you have installed! Just my opinion! Good Luck! Jim