hey whats up. i got a 66 xr falcon coming back from the panel shop soon with fresh paint. its got a 250 pre cross flow in it. when it comes back i was looking at spending about a $1000 more on it. would it be worth spending it on the 250 pre crossflow or put a 250 x flow in it. if you think one is better than the other what mods should i be looking at to get a good gain. I know a 2v head and exaust system are the go for the pre cross flow but what else? would those gains be the equivalent to the mods done to a 250 x flow. i hope someone understands me, i'm starting to confuse myself now.