They were really doing things individually back then. I agree, much better for cruising. So if you don’t have a fan clutch you probably have a long water pump. My Cutlass had a downflow rad with no clutch and a 4 bladed fan. Both the Jetfires with fan clutches have a 7 blade 18″ fan and the very short clutch and the short pulley for the big hub. The difference between short and long WP, other than the big hub which I am not using, is only the length of the shaft and you need a short pulley since the shaft doesn’t stick out as far. I converted my Cutlass from the long pump/no clutch/4 blade fan to a short pump from D&D, a alum short pump pulley from D&D, and a Hayden 2765 fan clutch. Very tight to the rad with about 3/8″ spacing from clutch fin to rad. I then went to a Northern Alum crossflow rad and matching eng driven fan shroud, that you have to customize, and a 15″ Flexalite fan clutch fan(not a flexfan). You can use a Derale 17-18″ fan clutch fan since you don’t have the shroud setup. I believe the same setup will work for you and if no one has a good solution for the original fan clutch we will be using the set up, but using the stock crossflow rad, on the 2 Jetfires under restoration. I’ll take some pics and post my setup which is different than how the Jetfire will be done.