17's on my 67

Thinking of purchasing these rims to get the look I want without changing bolt pattern. I upgraded all my suspension on my 1967 Barracuda, keeping the 5 x 4 bp and am wondering has any warnings for me before I buy them. 17" 5 x 101.6 with 4.5" back spacing.
Boyd Coddington Wheels BC1-786445G
Boyd Coddington Wheels BC1-786445G Boyd Coddington Junkyard Dog Series Gray Wheels | Summit Racing

I have read I may need more than 4.5 backspacing? Don't want to have to make any body alterations.
Also wondering how drastic this may effect the ride from a 15" rim...
Any help would be appreciated