if strictly mud, headers for 100 bucks (or cheaper) per pair and strait to a short pipe and cherry bobs at 20 bucks per and a cam and timing chain (i perfer cloys double roller for cheap reliability) usually u can get both for around 200 bucks. dont go too huge, the big cams could make it so u cant run regular fuel in 305's (they have higher compression) just go with a big RV cam for more torque and poof u have about 30 more horses that will be swallowed by your bigger tires lol, best off finding a used 350 that doesnt smoke and perform the same modifications to it, 305's are so limited by their heads it isnt even funny, you will be better off in the end plus you can do the cam swap while the truck is still running around and be on an engine stand (if you have access)
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1979 2wd k5 blazer- parked and will have engine pulled and original put back in and sold
coming soon: rebirth of an 81 malibu coupe 
fast - cheap - reliable: pick 2
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