I have a 1989 Pontiac Firebird, 2.8L, auto transmission, all stock. I may buy a 1984 Pontiac Firebird with a 2.8L 2bbl but with a manual trany. Wich car will be faster? And can I swap the manual transmission on my 89 bird? Thanks

 

Sure ya could
BUT What's better?
Dump the 1984 Drivetrain & INSERT ANY V8 & STICK SHIFT SET UP YA WANT!
Go have fun for dirt cheap!!!

 

Well, I know V8 is better, maybe later... But wich car between the 2 is the fastest?

 

My 85 maro will spank both of those jk

1984 112HP
1989 135HP

The 89 Firebird is faster but check out that link on my thread "carb 2.8s" it might change your mind.

 

Both vehicles are probably aged.
Both would be slow especially off line.
Slower of the two?
More than likely the carb version.
Easier to upgrade/hop up, would be the carb & stick car to V8.
It's way more complicated to change a MPFI car to a V8, and for that reason I did the 1995 3.4 engine swaps for my two examples below. My Blazer is a carb version w/3.4 power.
My Blazer had topped out at 95MPH with good tail wind with original 2.8 engine.
My Firebird went about same speed before I blew that 2.8 engine.
My 3.4 Firebird can easily get to 110 plus. Speedo "quits" at 85mph. And currently need to rebuild linkage for better feel.
See if you could find a V8 car same price range.