Thanks everyone. I think I'll go with this combination, hopefully I can find some reasonable priced, decent tires with this combination.
Rims & Tires:
Front rims: 17x8, 0 offset. Tires: 225/45R17. This will be me a 25" diameter, 9" width and 4" sidewall.
Rear rims: On the fence between these 2 options. A few of you guys also reached out to me on the rear wheel offset which I really appreciate. Would a offset of 6 be enough for 285s?
18x9.5, ?? offset. Tires: 275/40R18. This will give me a 26.7" diameter, 10.8" width and 4.3" sidewall.
18x9.5, ?? offset. Tires: 285/40R18. This will give me a 27" diameter, 11.2" width and 4.5" sidewall.
On the rear of my '66 (with a stock 66 rearend), I could fit 17X9.5 with 275/40/17 with BOTH
6.0" BS AND 5.5" BS... The 6.0" BS will be close to the inside tub, while the 5.5" fit really well...
IMO, the 9.5 wheel with the 6.0" BS looked goofy, as the wheels/tires seemed to sit INSIDE too far...
Then again, with deeper back spacing, you can use a spacer to fine tune the location...
BTW, I ran 275/40/17 on 17x9.5 wheels all around... But due to the C5 Corvette disc swap up front (Kore3) and the thin spacer allowing the wheel to clear the caliper (weld bead between the center-section and barrel of rim rubbed the caliper fins), I had to run a 6.0" BS on the front... I wanted to run the same wheel/tire on front and rear, so I tired the 6.0" BS on the rear... Too much clearance (visually) at the outer quarter panel lip, IMO... So I ended up with the 5.5" BS on the rear (plenty of clearance for a rear disc conVersion, which never happened until after I sold the car).
Here is the 5.5 BS, although not a great picture..