right i have had a read and reminded myself. the 85bhp commonly associated with the carrier No.2 (mk1 and 2) and the 95bhp associated with Carrier No.3 Mk 2 have 24 head studs and 14mm spark plugs. the older Mk1's only had 65Bhp engines in (if they were British) that said all the engines were interchangeable so it is not uncommon to find an old carrier with a 95Bhp lump in
it is however important that you make note of what you have in the carrier as the components of the 85/95 bhp engines are totally different to the others.
speak to Kevin Powles who can provide you with a service manual at a good price ! if he cant or has none left come back to me and i will sort you one fella.
cheers
Richard