The block will say "hecho en mexico" and I'm 90% sure that they are not roller blocks, so you need to figure on either machining it to aqcept the stock spider setup or buying retro fit lifters which will cost your between 300-400 dollars. Personally I wouldn't waist my time on one.
it's def. not worth the extra effort. yeah they are a little bit stronger but for the amount it would cost to buy one and have it machined to work for new style 302s, it would be cheaper to buy a new 302. mostly used on old school set ups.
Run yours till you see a problem I know people who are making numbers like yours and have been running the stock block for a while with a good tune and no prob... If you want a better block then buy a fms R-block for about 900 or one step above that dart for about 2500 but this one is bulletproof Forget those mexicans they are hard to find and they are cheap you can probably get an r block for that money you see guys who still have one think its the best thing since swiss cheese and they want a bunch for it...:SNSign:
I suggest the dart sportsman over the ford R block. The R block cost a little less than the dart sportsman but its requires more machine work from what i have read. Figure an R block will cost you around $1600, and a dart sportsman will be in the $1900 range. The nice thing about the sportsman is that it is machined to accept the stock lifter hold down, so you won't have to machine it like the R302 or run retrofit lifters.