What pre-strut car has the same wheelbase as a 1973 2 door Ford Maverick?

Before building a monster engine to make it go you need to think about upgrading everything else that makes it stop and not just go around corners, but handle well through a series of corners.

It would also pay you dividends to examine the stiffness of the body. There was a case where Ford increased the power of one of their small cars in the 1960's only to later discover the increased torque reaction from the rear axle was causing some alarming cracks at the rear of the body shell. Subsequent cars had many extra pieces welded into the structure.

It is true for most people most of the time the manufacturer's specifications make the best compromises it is possible to make though it should be recognised a manufacturer never puts more into a vehicle than is needed; a production vehicle is like a delicately balanced equation and when something is changed the equation will become unbalanced unless other measures are taken to rebalance it.

It is quite impossible to answer your question as it would take hours of wading through vehicle data references just to make an initial list of possible vehicles and then more time to examine and measure possible donor vehicles in a number of breaker's yards. I suggest you begin by approaching your local repairer and asking if you can search his old data books and the dimension you are seeking is not the wheelbase (the distance from the front axle to the rear) but the track (the distance between the wheels on the same axle).

Starting such a project with the engine is rather amateurish and often doomed to failure.
I advise you to read some of the wisdom on the subject from the famous David Vizard and his contemporaries.