Yeah, I'd check fuel pressure at the rail, but I bet the old engine is just dirty and/or carboned up.
Pour 1/2 can of Seafoam in your fuel tank for starters. If that doesnt work after about 100 miles, then change the spark plugs, wires, rotor cap, distr. cap and then clean your throttle body. Do NOT let the coil wire cross any of the the plug wires as it exits the distr. cap when you swap wires. Go ahead and swap the air filter element and check for vacuum leaks too.
Cajun Recipes and Fishing tips
Words of wisdom, Posted by Zeejay:
"..it's not air, it is the opposite of air... suckage so to speak."