summit has a nice modern version of the ford 4100 4-barrel carb, i put one on my 62 lark with an r-1 engine, a little adjustment and i'm ready to go.good throttle respomce and improvement in gasmilage,but stay on the small end.even with a 390. an r-1 engine is studebakers base hipo engine made in 1963-1964 years.289 cid(no its not a ford engine it's a stude v-8)