If it's a L69 a set of headers , 1500-5500 dual plane intake will put you alittle over 200 hp if you wish to stay 305 the Weiland is better than the performer and with a RV cam will put you in the 270 range with good exhaust system . I had a 63 with the 327 , 4 speed and there heavy cars , use the RV camshaft. I had a stock L69 IN MY 87 SS MONTE and replaced it with a 427 roller small block 400 trans 9in ford 3.90 gears but I drag it and it wasn't cheap , but I had alot of good tire spinning fun with the 305 with just the parts I mentioned. Stay with know larger than 2 to 2-1/4 exhaust with good mufflers for torque with that cam. You'll have fun enough, by the cam for 9.5 to 1 if it's the L69 as far as I know all 86-88 SS MONTE CARLOS WERE. GET THE NUMBERS BEHIND THE ALTERNATOR ON THE PASSENGER SIDE AND CALL THE DEALER THEY CAN TELL YOU.I know this is a odd one, but I know plenty of 305 knowledge on here. I have a 64 Bel Air with a 305 Monte motor in it. I just bought a Sniper EFI for it. Well after looking at instructions I noticed it states has to have a minimum 200hp. Currently car is stock 305, edelbrock intake with true dual/no converters of course being a 64 X frame car. Do you guys think a cam along with current combo will get me close to my 200 mark? I truly have zero concern on making a "fast car" I just wanted EFI on my cruiser, I don't wanna 350 swap it, lol.