A mate of mine in the late seventies took me for a spin in his Hunter with the holbay engine and for a 4/5 seater saloon was bl**dy quick
and if i remember rightly sounded pretty good to 8-).
Very nice - the Holbay engine was the one to have. Just wish I was old enough to drive when these cars were in production!
:(Sadly i'm old enough to remember a few rootes group cars including hunters. The holbay was a right mover in it's day & much loved but the handling was awful. I know all cars of that era were vague to say the least but equivelant cortinas,vivas etc were a little more sure footed.
Still, cracking nostalgia, i drove these type cars as a teenager so happy memories 
As to the Avenger they do handle well, my mums estate was excellent, had a prat in an Escrap trying to keep up down a lane while I was driving quite carefully, if I had known he was trying to catch me I would have booted it properly and gone

The knobend claimed to be an off duty Policeman, but his driving left a lot to be desired, but if a carefully driven 1.6 Avenger Estate can cause a FWD Escrap to struggle what does this say about Escraps?
If you want to improve the handling, shorten the wheel base and fit stiffer std ride height springs, better dampers, a hatch body, and pretend you are rallying

That said the Estates axle was better located with a 5 link panhard rod setup, the saloon and hatch had a 4 link setup