Re: 94 tempo 4cyl-v6
Yes, a used SHO would be the way to go. It's actually an involved process to do an engine swap, as you'll need the engine, trans, wire harness, computer, and other related hard ware. Not to mention you'd have to get slightly stronger front suspension components due to the added front end weight. For now, I'd keep the 4cyl and once it dies, or comes close, trade it in.
'11 Ram Quad Cab 4x4 SXT 5.7L HEMI (stock); 48,500m
'06 Pontiac G6 GT 3.5L 220hp; 64,000m
'12 Chrysler 200 Limited 3.6L 283hp; 28,000m
'99 Taurus 3.0L 2V Vulcan 145hp; 154,300m - Traded
Amsoil in all vehicles!