Hi folks thanks for keeping the input coming,

Iv sketched out proven plans for a 1800 zetec carb conversion thats cost effective,
1800 blacktop
1800 standard clutch
Type 9 rwd box
Rs2000 prop
Rs2000 diff and rear axle
Custom exhaust
Custom inlets to house carbs or modified standard inlet with silicone connections
Carbs Twin weber 40's / zx7r / r1's
Megajolt

I think this is pretty standard, there are brilliant guides out there but i questioned the whole carb conversion.

My next questions will relate to efi,
I dont understand what no pats is, from an escort?
The mk4 efi conversions iv seen are fiesta rs turbo's, i considered this for my own rs turbo build but then i backed out and stuck with the mfi setup.
Like the above list of carb conversion main components, i need to do the same for standard efi - i assume here braking a 1800 mondeo will provide everything i need, with exceptions of exhaust etc, obvious parts

Heres a big question, does the cat converter come with the engine or the car? Will a 1979 shell require the cat even with a 1999 to 2002 engine fitted on efi?

Il probable head to suspension options next, before brakes.

I appreciate the info, big thanks for posting mpg's on carbs!