engine copmpatability ( m reg hijet 1000 to r reg hijet)


hi all - im new here and know nothing about motors.

i have an R reg hijet (petrol manuel) and i need a new engine for it - there is one goin but it is of a m reg and they are slightly different..

the old one has a carbutattor while the new on has injection... i have been told that its not worth the hassle to try and fit it in...

it this the case Unknw

if so does anyone have a engine for an m reg hijet that aint too expensive?

thanks for your time....