Hi Bon,
I'm almost certain that you will have to use an earlier 60102 Briggs Engine as the current ones just won't fit without making alterations to the lower handle bar set up or adding those adaptor plates to push the lower section out and away from the chassis mounts.
The 60102 uses the shallow fuel tank which is the issue that prevents you using an 80202 engine which was the 3 Hp orange painted engine that was used on the later twin railed 17 and 20 inch Scotty's.
Cheers,
BB.
