Will these rims fit on my

Steve,

Like tx65coupe said they will fit.

You are going need spacers on the front for clearance, and want spacers on the rear to make it look right.

I am running 18x8.5" 255/35's up front and 18x10" 295/35's in the rear on my 69 Mach I. I needed a .5" front spacer, but the rear was perfect.
 
A guy on craigslist has a set for $650 with tires. I didn't think was to bad of a price. Where did you buy your spacers and how much were they?

Thanks Again
Steve69