"Cheap" Weld Wheels: Ventura S104 - Opinions?

Well, both the 18x8 and the 18x9 you listed will fit on the front. You could run a 275/35/18 on the front if you wanted with that 18x9. With the 18x8 a 245/40/18 would work. But you could also run that 245/40/18 on the 18x9”.

Unfortunately, neither one is really a good choice for the rear unless you run a spacer. If you have an A-body 8 3/4 with BBP axles and the stock spring locations you want about 5” to 5.25” of backspace. You should have close to 6” from mounting face to springs, so about a 1/2” for tire overhanging the rim and another 1/2” (ish) for clearance. If the 18x9’s come in a different back space that would be good, otherwise you could run a 1” spacer and that would be just about right for a 275.