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Looks like a 3.8 to me.
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L99 (4.3L)
A 263 in3 (4.3 L) was based on a 305 in3 with updated block architecture to be Generation II and a reduced 3 inches (76 mm) stroke. It was designated the L99, and was introduced in 1994 for the Chevrolet Caprice. It was externally identical to the LT1, but the bore was 3.736 inches (94.9 mm) and the stroke to 3 inches (76 mm) giving it a displacement of 263 in3. The pistons used in the L99 were the same as the ones used in the Vortec 5000, but 5.94 inches (151 mm) connecting rods were used to compensate for the shorter stroke.
Like the LT1, it features sequential fuel injection, reverse-flow cooling, and an optical ignition pickup. Output is 200 hp (150 kW) and 245 lb·ft (332 N·m). Due to its smaller displacement, it provides better fuel economy than the 5.7 L LT1, but at reduced horsepower & torque levels.
[edit]
Geez Tyler, that thing looks worse than the one you already have.
Not even.
Both rockers are there. Not dented in from someone running into it with a front end loader. Way nicer interior. Floor boards don't feel like they are about to cave in. Doesnt have swiss cheese quarter panel Guy wanted $1900 for this.
Looking at a 79 Trans Am tomorrow
APE (Ames Performance Engineering, www.amesperf.com ) sells the front of rear wheelwell patch for $32.00. From the pictures you posted it doesn't look like that patch will cover the extent of your damage to the quarter on the car though. You'd probably be better off getting a partial quarter skin. APE has those too. Heck, APE could probably supply 85% of the stuff you need to restore that second gen.All they have in patch panels is the lower rear rocker