Sounds like a nicely updated Buick 3.8L
https://sandiego.craigslist.org/csd/cto/d/1948-cj2a-willys/6556979131.html
“I have a 1948 Willys for sale, the body is in great condition, very minimal rust and one small dent, really clean for the age. Bought this Willys not running and rewired it put all new gauges in and replaced a few things under the hood, added a 4 barrel intake and edlebrock carb, electronic distributor, new radiator and electric fan, threw all new spark plugs and wires In it. Leland Clutch, PP and TO bearing, Hooker fenderwell headers
Buick v6 3.8l with Crower RV cam .505 lift, 310 duration, Manley stainless valves, Forged 9.75 pistons. Dana 44 rear axle with Detroit locker and warn locking hubs, front I think is a 35 has a true trac and warn locking hubs 5.38 ratio. Has 99% tread Mickey Thompson Baja mtz 33×12.50r15. Has a t-90 from a 72 Cj 4 speed with granny low, has a terra low kit in the transfer case 3.5 to 1 Dana 18. Original seats. I have a full soft top and doors for it and also a bikini top. Fun little cruiser, walked up John Bull no problem, goes all over truckhaven. runs good but could still use some tuning in. Can’t afford to keep an extra car anymore and no room.”