What have I bought on a whim?

As the title says I bought these two 1/24th scale cars on a bit of a whim and why not.

Don't really know what I've got or from what period so any help appreciated.

First up



My first thought is a McLaren body?. The writing on the cockpit is M.A.C (or G). I'm assuming pre painted as the finish is very thing and translucent and there is some clear plastic where the wheel arches have been cut out.
Chassis is steel..





Ignore the motor as someone has fitted a Johnston.

Second up

with a brass chassis



Can't see any markings and from the design it looks to be adjustable?