1st let me start by saying that you have a nice looking no violated super88 dsl.I can tell you fom experance that its tuff to gain much HP from a diesel with out a turbo. On my super 88 dsl I had over sized pistons ,reground cam,oversized valves ported , polished  &amp; milled head, rosamaster inj. pump &amp; fuel system off a 1800 that was cranked up for more fuel &amp; lighter govener springs for higher rpms &amp; quicker throttle responce,bigger tips on the injectors, larger intake manifold off a early 1800 dsl with round port intake. &amp; with all the time &amp; money spent  I gained a whopping 10 hp and thats streaching it. oh ya I ran without a alt. or generator as they can rob HP. The dsl is cool looking as they really can turn the sky black when you are going down the track.  I was going to go as far as boring &amp; stroking my dsl but was told by the engine builders that with the dsl with only 4 main bearings  might not take it too well. At that point of spending a pot of cash &amp; not much return on my investment. I did bore &amp; stroke my block to 426 cid  but I broke down &amp; put a 1650 gas head on it.WOW what ride. No more smoke but i lived &amp; learned I wish you the best of luck. &amp; have fun pulling.