V8monza.com offers a bolt in for the Vega if you do not want to do an fabrication but they are not cheap.
there are several things to consider but 26" wide x
16" high in aluminum.
most chevy radiators are 19" tall which will hang the bottom and the cap will be friendly with the hood.
are you going to run a mechanical fan ?
driver side alternator ?
retain the stock core support or modify it to move the radiator forward ? if you are moving it into the core support skip the filler neck.
For cars with a mechanical fan and drivers side alternator mounting,
aluminum radiators can now be had in dual pass configuration allowing the upper hose inlet to be on the passenger side away from the alternator belt and fan blades.
Griffin Aluminum Circle Track Radiators 1-58221-XS is the 26" wide x 16" high dual pass with straight lower inlet
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if you move it into the core support add an inline filler to the upper hose.
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