Here's the definition of a G body: 1982-1988 rear wheel drive full frame car, 1978- 1981 A bodies are essentially the same but the designation A body was used for the Celeberty/ Cutlass Ciera, etc models starting in 1982 so GM changed the name. Models of A/G bodies include: Cutlass Supreme, Cutlass Cruiser, Cutlass Salon, Hurst/Olds, 442, El Camino, GMC Sprint (GMC's El Camino), GMC Caballero, Malibu, Monte Carlo, Malibu Classic, Grand Prix, Regal, Grand National, Century and Bonneville ( 2 yrs only). I am sure I missed some, but you get the picture. Honda has NOTHING on GM for interchangeability!

F body is Camaro/Firebird. A Corvette would be a Y body.

Opti Spark is a distributor mounted on the crank snout and not an individual coil pack system like the LS1 uses.

I drive a 1985 Cutlass Supreme Brougham with a 1977 Chevy 350 bored .030 over and a TH200 4R overdrive trans. My rear is a Monte Carlo SS unit with the 3.73, gov lok setup, but hey, it was cheap ($150) and I am on a limited budget. My car came with a 231 Buick V6/ TH200C combo with a 2.41 axle stock, so I have done a complete swap on mine. I also run Eibach Pro Kit springs, and have removed the body partially from the frame and rebushed it with an Energy Suspension Polyurethane kit. I swapped a set of the factory FE-3 suspension sway bars in 1 1/4 front and .75 rear along with the IROC Steering box that gives me 2.25 turns lock to lock. The front end has also been completely gone through with ES bushings , and I will have the popular negative roll conversion by Global West done soon, which revises the camber curve and gives you 12 in brakes to replace the 10'5 in stockers. Another thing I have is the power steering cooler form a Z-28 and a special factory aluminum hood which pulls about 30-40 lbs off the nose. A 9C1 Caprice supplied the oil cooler kit ( the car was a taxi that started life as a cop car, Copher's Tampa had about 30 of em a few years ago and I pieced mine together from those). My car runs a carburetor and was formerly a pizza delivery car, so carbs are plenty reliable. I just started mine after 5 years of sitting and waiting for me to complete the restoration and it started on the first try (but I did do the proper pre start prep).

Before yo do this, take a trip to Copher's and familiarize yourself with the different variations of 80's RWD GM cars. Most have parts that will interchange, especially between the early A, G , F, and B body cars.