302 casting swirl port heads

You may know that the 4233302 heads have smog pump holes under the exhaust ports to plug. I tapped them to 1/4-20 and threaded bolts in. You will be better off getting a length checker pushrod from Comp cams, ball/cup, and getting the proper length pushrods. 7.500 is a rough stock length, sometimes you need a little more. I used the stock 273 adjustable rockers on my 318 but I had to use shims available from Hughes engine to cente the rockers over the valve tip. All in all, it is a litlle bit of tinkering but the "302" heads work well with smaller bore engines.