I am having a difficult time deciding which of my engines to install in which of my planes. Here is what I have to work with.

TopFlite Cessna which I bought used and removed an old OS FS90 four stroke which seemed underpowered and low compression.
TopFlite Corsair Gold Edition which I am building with flaps, cockpit and retracts - monokote covered.
GreatPlanes F14 Tomcat which I have not started building yet with retracts.

And here are my engine choices.
OS61FX w/ MACS pipe
SuperTigre G75
SuperTigre G90

I put the OS FS90 in my Goldberg Tiger 60.

My 1st though has been OS61FX on the GP F14, side mounted with MACS pipe
ST G75 on TF Cessna side mounted with TF in cowl muffler or PITTS muffler
ST G90 on TF Corsair side mounted with PITTS muffler

Any advise on which engines should go where and the appropriate prop sizes would be appreciated!

Thanks,
Rob