The 318 is a lot stronger internally than people think and will rev no probs, the bits you got on there no doubt work well and if you got a cam of around .450" max in there, similar to a stock 340 cam, all the better as that will make a nice package with the other mods.
Only thing I would say is if your weiand intake manifold is for a 340/360? you'll have a mismatch in intake port sizes and could do with matching the intake ports in the heads as they are smaller. Also if you haven't already... make sure with that set up you got a total of 36 deg timing for optimum power, you could improve things by fitting 360 valves, but its not that important. Apart from the cubes you've got a much better package there than the 360 from the truck and your right to stay with it...and once you fit some 3.55's it'll fly....and of course you've got the Gas to go
Les
