Let's Talk Inline Perfomance!?

[chevylookin]

Hello forum. Ive only been on here bouta week or so, and everyone here has given me awesome insight! Thank you. I want to open a thread (sorry if it has been done before but I am still trying to master the "search engine" skill) on inline 6 performance.
A quick summary: I own 2 vintage chevy trucks. I have a bone stock 52 standard short bed. I have cleaned it up and I get thumbs up at the shows. Its great for goin to the grocery store once in a while and I think it tops out at 50 mph. Nothing that my wallet could ever consider turning into a daily, but I love it. I also own a 64 C10 short bed fleet. I have owned it since I was 21. I am 32 now. I have bombed it everywhere with its straight 6 and 4 speed granny. I will never part with it.Ive put 40 K on it in 10 years! Maybe the 52 if I really need the cash. This 64 has potential and I want to be rid of the Siverado due to gas prices from hell again, sooooo......
I have put disc brakes and up-ed the rear gears in this 64 to 3:08's for better freeway drivin cuz I wanna make this my daily (again). I love the L6. Its great on fuel consumption and I have plans to do the T5 tranny swap soon. Basically, what Im gettin at, is has anyone done a performance upgrade on their 230-292 for a daily driver? Im talking about lump porting heads, enlarging valves, mid to high performance cams, double singles carbs, single four barrel carbs, or just sticking with a single but doin mild upgrades to boost performance. Kind like when you are trying to get onto the freeway and trying to merge with traffic and just wishin your lil 6 would get up and GO! But also conserving fuel at the same time?
I dunno, I know my lil 230 has has 130ish stock HP and I would guess I bumped it up to 150ish? maybe by putting in HEI and dropping the fanand puttin in an electric? Id like to get it up around 180-200 HP? with the T5 tranny. What are your suggestions from here?
I will be posting pics as soon as I can stop bustin knuckles and start bustin out the camera. Oh yeah, is there really any HP boost from splitting the exhaust? Thanks forum!