Bush mechanic method-cut a chunk out of neighbours bbq plate [steel] and with the aid of a paper template rubbed over the block's mounting holes with greasy fingers [to accurately mark hole positions] drill the holes and bolt the plate to block.
Put engine [block] in desired position.put desired mounts in their spot and mark the bbq plate where you require bolts to magically appear.unbolt the bbq,drill holes and weld bolts in.finito.drink more beer.Merry Xmas.Pete.