1966 SUBURBAN "Survivor" Now what??

[1966burb]

Reaching out to all the survivor, unrestored, factory correct truck enthusiasts on this site for input. My 1966 burb is a 98K mile survivor, it has had one quicky paint job , but otherwise original. I have owned it twice in the last 24 years. When I got it back the original 327 had been replaced with a later 350 but the complete engine was sitting in the corner and included in the sale. The engine and accessories are all numbers correct with proper date codes. Block, heads, intake and exhaust manifolds. All pulleys, alternator, distributor, carburetor and volt regulator are all correct.

I have pulled the front end off and the 350 engine is out. 327 is at the machine shop for complete rebuild.

First question, I am thinking of just scrubbing the frame and fender inner panels and putting it back together. My thought is trying to perserve it as is.
Any thoughts??

I did venture out of my keep it all stock box and made 2 changes to make it more driveable as I do pull a vintage travel trailer once in a while. I added disc brakes (it did have factory power brakes and I had the original booster rebuilt) And I added a 700R4 transmission.

My goal for the 327 engine is to do a factory correct restoration.

I did a 1961 Corvette Fuelie to NCRS standards in the 90's so I am familar with the challenges. The only thing is that Corvette had a judging manual which spelled out all the correct casting #s , part #s and paint colors which made it fairly easy to achieve the goal.

Thanks in advance, as I will be reaching out for correct part numbers and paint finishes on this restoration.