Quick question about swapping

I've resently been inquiring about swapping out a /6 for a 360 in a 74 swinger.
Today I just came across 75 valient With a 8.75 rear end ,small block torsion bars, brakes blah blah. I'm wondering if there is any difference between the two 74 & 75, nice rims and new rubber, K-member the works for 400 bucks.
Don't think I can afford to let this one get away