i just bought a "83 22R with 46,000km's on it that im planin on puttin in my truck in place of the old worn-out 20R. would it be worth gettin some head work done 2 the 20R head n puttin it on my 22R block? im runnin a top-load 4-speed, 4.38 gears, posi rear n 33" tires but thinkin bout upgradin 2 35"s. any suggestions would be great!