* Dipstick Location: This is the most obvious difference, but it's a symptom of a larger problem. The location change reflects different engine block designs. You'll need to find a way to access the oil level, possibly by fabricating a new dipstick tube or using an aftermarket solution.
* Oil Pan: The 305 and the late 70s 350 likely have different oil pan designs. The 350's pan might not fit the 1986 Trans Am's frame and suspension components. You might need a custom oil pan or significant modification.
* Engine Mounts: The engine mounts for a late 70s 350 are unlikely to be compatible with the 1986 Trans Am's mounts. New motor mounts will be necessary.
* Exhaust System: The exhaust manifolds or headers on the 350 are likely to be incompatible with the 1986 Trans Am's exhaust system. A new exhaust system will be required.
* Wiring Harness: The 1986 engine's computer and associated wiring harness are specific to the 305. The late 70s 350 is likely a carbureted engine (or possibly a very early fuel-injected system), requiring entirely different wiring. This can be a very complex problem to solve.
* Transmission Compatibility: You need to ensure the transmission in the Trans Am is compatible with the 350. The bellhousing bolt pattern and input shaft diameter must match.
* Fuel System: The fuel delivery system (carb or fuel injection) will be different and needs proper adaptation.
* Accessories: Power steering, alternator, and other accessory brackets and pulleys might not align correctly. You'll likely need to source compatible components.
In short, while it *might* be *possible* to perform this swap, it's a far more substantial undertaking than simply dropping in an engine. It requires significant mechanical expertise, fabrication skills, and potentially a substantial investment in parts and labor. It's not a beginner's project. A more compatible 350 from a similar-year vehicle would be a much less problematic swap.
