first one suzuki SJ or daihatsui - thats not a landy chassis or axles
bottom one, disco or range rover chassis - guessing range rover by no rear crossmember. Thats a LWB salisbury rear axle too.
I think I can see the original RR classic steering wheel too
Almost any 8 speed built between 1970 and 1990... Engines are all kohler k series or magnums, which are bombproof
if if you plan to rotorvate, then probably go for 12-16 Hp. Model wise that's a big list, but anything from raider 12/14, through C-120/160, C-121/161 up to 316-8.
we are all running 30-40 year old machines