Here's an idea...get out your torch and cut the block into 8 pieces, each containing one cylinder.Now, throw 2 of them away and weld the remaining 6 side to side. Then you take the heads and cut of #1 and #2 combustion chambers. Put the two heads together, so all the intakes are on one side and exhausts on the other and weld those babies up. Now, this is the tricky part, you'll have to heat the crank shaft until it is red hot and stretch it. Be sure to stretch the non-essential journals so you don't upset the rod to crank tolerences. Once you have completed the rotating assembly, it is time for itake and exhaust.
First, that the headers and cut of #1 and #2 flange and runner, now they should bolt right up. The intake is a bit more tricky. You have to split the manifold right down the middle, and liek the heads and exhaust, cut of #1 and #2 ports. Now, go down to Napa or car quest and get two of those carb spacers and about 10 tubes of JB Weld. Bolt the carb spacers to the remaining carb bolt holes on each half of the intake. Now use the JB Weld and some old license plates or cookie sheets or whatever to seal up all the gaps. Voila....a dual quad intake. Now the only things left are cosmetics. i.e. oil pan, timing cover ect. Luckily modern sealers make this possible. This will give you more torque than your standard 350. Hope this helps.
P.S. If this sounds like two much work, you could always go buy a GMC 302, bore it .060 over and have a 348 cid motor with a block light enough for one man to pick up without much strain and more torque than a 350 would ever hope to have.