Engine upgrade

[Snowfork]

This is a 4afe head, notice how there is one protrusions for a timing pulley and the other cam runs off the driven cam that connects to the timing belt.

[Snowfork]

This is a 4age head, notice that both cams are driven off of the timing belt. There is no internal gears that connect the two camshafts.

[Snowfork]

This means that a 4age has both camshafts turning clockwise, in sync with the crankshaft.
The 4afe has one cam turning clockwise and one turning counterclockwise.

Unless you are a magician or willing to have custom cams made and/or redesign the top end, this is an impasse.

[subspec]

AHEM. 5sgte. aka 5sfe with 3sgte head. you need to do alot to make this actually work. your honestly better off just purchasing a 4age/gze, i myself probably could do this swap in two days. but thats me. for you id take at least a week or two.

[subspec]

heres kinda the concept that you can see by the ghost gears as i call them.

[Snowfork]

Originally Posted by subspec

AHEM. 5sgte. aka 5sfe with 3sgte head. you need to do alot to make this actually work. your honestly better off just purchasing a 4age/gze, i myself probably could do this swap in two days. but thats me. for you id take at least a week or two.

Subspec, you could probably build him a new car in the time it will take anyone else to do a proper, above board engine swap

[Snowfork]

To return to the original topic, it will be much easier and slightly more expensive to put a full, unmolested/rebuilt production engine into a car than to go swapping a new head or one off a different powerplant onto an existing, worn engine.
It just asks for trouble down the road.