I had an HZ Wagon, 253 traumatic.
All the power of the 202, and the economy of the 308.
Although after fitting a Q-Jet 4bbl and manifold, drilling the EGR valve to provide EGR at idle, but with the EGR ports directed through pressed in tubes so that the EGR was directed at the idle air ports, the PCV routed around an exhaust manifold in tubing wrapped in ceramic fibre, and hitting the carb at lord knows what temperature...hot air intake, with the thermostat removed from the hat.
Coolant thermostat in the lower radiator hose controlling coolant inlet temperature. Full vacuum advance at idle. Partially blocked the RHS exhaust manifold to force more heat across the manifold floor heater.
Fuse wire in (IIRC) the idle mixture tube to get control of the idle mixture screws again.
Had all the vacuum heating stuff ported such that at full throttle, everything lost vacuum and reverted to "cold".
Was a cow to start and get running, but got 30MPG.
Channelling Smokey Yunick and his hot vapor cycle.