Ok I got two gas converters for an el on tickford gas a vialle f type anda pernumia r90/e ,hope I got these names right? but anyway is there a difference as to which one I use?The vialle is way bigger so I would guess biggers better?

Ummmn NO!

The R90 is a much better converter. Read around.

Even if you have a Vialle fitted to the factory gas, swapping over will give better response.

There are quite a few other factors that affect whether a system is good or bad. The converter is just one of 4 major "parts" in the system.

Ok sweet.cheers mate the conversion to the r90 will be underway

Before racing off to change things pause a bit and think about what needs changing.

I am flat out at the moment so can't type much. Please read thru the threads here as this is well covered.

I assume you will have the old Open Loop system and there is no control method. Hopefully you at least have a power control valve in the gas line to the throttle body or wherever they fed in the gas to the air snorkel.

Takes some photos that show what you have and post them here as many guys know what they are doing and can then comment of what may be your best strategy.

my old car was an el which a truck rode off,basted it had sprint gas all worked so I should....,have all the parts even if it means rebuilding the hole system