[ZL1power69]

if you have the 95 4.3 (intake manifold has the raised runners and the black plastic vortech cover) then you are fairly limited on mods. That engine has one injection unit, refered to as the cpi unit (central port injection). it has 6 individual nozzles, 1 per cylinder, that are all fired at once. There is not a strong aftermarket following for this engine but the basic lower cost mods that come to mind are a performance exhaust, intake, aftermarket ignition with more powerful coil and larger plug wires, 1.6 roller rockers, under drive pulleys, and an electric fan. As far as forced induction, there was a supercharger kit made a very long time ago that was discontinued but no other kits exisit for this engine. The factory MAP sensor does not read boost so a replacement would be needed. I would not recomend going with forced induction on a stock CPI engine. Now if you wanted to get serious you could completely tear the engine apart and rebuild it with forged internals, new or ported stock heads, and replace the CPI with MPFI. A member on this forum, Blazer SS, has a 98 blazer with a fully built engine with the vortech supercharger kit so if you have any specific questions about a 4.3 performance build up, he's the guy to ask. The problem here is you have now probably exceeded your trucks value with the cost of these aftermarket parts plus labor if your not mechanically inclinded. So is it worth it, i say no, but only you can make that decision.