My '74 was soooo easy to install mega-squirt which is way cheaper than repairing the ECU and will get at least 6 miles to gallon better milage....i also have a '73 that that is a 350SLC and hoping to put the heads on and gain the 9.5:1 compression ratio and will take them to local head shop and flow them better...with mega squirt you can just adjust your VE tables to compensate for any thing you do..i am planning on getting the cams reground for little more zing. heads are my next winters project when i take out the engine and detail bay..Right now i am just reinstalling seats and then off driving to adjust fuel tables ..now on the CIS injection its much more work ...Jeff