Just sell the 1.4 and buy a car thats already a 1.6, its a different engine entirely so its a huge amount of wiring, for not a massive performance game. Plus to get all the parts youd basically need to buy a full car
Yes that is good advice, to change the engine and cpu to run it, will be a nightmare if you are a novice, also the suspension and braking system would need a complete overhaul & upgrade, consider a nitro additive in the fuel and iridium spark plugs for starters. also a full engine service, would be needed. so improve what you have, or consider a replacement as tdp2612 has recommended.